TIL about the Diatone, a 160 cm subwoofer capable of producing minor earthquakes.
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Diatone D-160 Specifications Diatone
https://audio-database.com/MITSUBISHI-DIATONE/diatonesp/d-160-e.html
https://audio-database.com/MITSUBISHI-DIATONE/diatonesp/d-160-e.html